Classifications

• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
• • C—CHEMISTRY; METALLURGY
  • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
  • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
  • C12N1/00—Microorganisms; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
  • C12N1/12—Unicellular algae; Culture media therefor
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W10/00—Technologies for wastewater treatment
  • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
  • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

Definitions

• the present invention relates to a process for the cultivation of micro-algae.
• the present invention relates to a process for the cultivation of micro-algae suitable for being used in the production of biomasses.
• the present invention relates to a process for the cultivation of micro-algae fed with industrial water coming from oil plants, for example refineries.
• Micro-algae cultivations generally use fresh or salt water with the addition of nutrients and mineral salts and, when necessary, vitamins, and are effected in open basins having large dimensions, for example from 10 to 100 m long and from 3 to 30 m wide, with a depth of 0.2 to 0.5 m, under solar irradiation.
• carbon dioxide is fed to the basins, stored, in liquid or gaseous form, in specific tanks, or obtained from the exhausted gases of industrial processing, for example from methane electric power stations, possibly diluted with air.
• the gaseous phase is bubbled through the liquid mass, through perforated ducts immersed in the growth basin, in order to have the maximum availability of CO 2 for the micro-alga.
• micro-algae requires few essential components consisting of salts and substances based on nitrogen and phosphorous, in addition to light and CO 2 as mentioned above.
• the minimum nutritional demands can be established on the basis of the following empirical formula of the algal biomass: CO 0.48 H 1.83 N 0.11 P 0.01
• the algal cultures consequently need P and N in optimal amounts to grow at the necessary rate for maintaining high biomass concentrations.
• This principle can be exploited for the removal of nitrogenated or phosphorated compounds from industrial wastewater, provided the other compounds present in the water do not create toxicity levels which hinder the growth or functionality of the algal cell.
• the nitrogenated nutrients are generally present as NH 3 and ammonia derivatives, for example as organic or inorganic ammonium salts.
• solutions of water-soluble phosphorous salts are fed, such as alkaline or alkaline-earth metal phosphates, for example sodium, potassium, calcium, magnesium phosphates or ammonium phosphates.
• the wastewater is separated and can be poured into surface water basins or subjected to finishing, which allows its recycling-reuse.
• the following experiments refer to the characterization of micro-algal strains in non-conventional culture mediums. More specifically, the culture medium used was wastewater from an industrial waste treatment plant.
• Tests were carried out in the laboratory to verify the proliferation of algae in this culture medium, using suitable systems for the growth (Roux bottles) consisting of glass containers of three liters each. The stirring of the culture was guaranteed by the gas (mixture of CO 2 in air at 2%) flowing inside the bottles. They were also equipped with a cooling system to prevent the culture temperature from exceeding 30° C. Each unit had sensors for the temperature and pH measurement.
• the carbon source for the growth of the algae was provided directly by the CO 2 which was introduced into the culture medium under pH control.
• the radiant energy to allow the culture to fix the carbon by means of the photosynthesis reaction was provided by an artificial light system (halogen lamp with a JB trade-mark, 100 watt, positioned 50 cm from the Roux bottle), left on for 24 hours a day, with a luminous intensity of 17,000 lux.
• an artificial light system halogen lamp with a JB trade-mark, 100 watt, positioned 50 cm from the Roux bottle
• the collection strain Scenedesmus sp. was used.
• the inoculum to be introduced into the culture systems was prepared as follows:
• Inoculum 10% by volume in the medium M4N described hereunder:
• Micro-elements 1 ml/l of the following solution: H 3 BO 3 2.86 g, MnCl 2 .4H 2 O 1.81 g, CuSO 4 .5H 2 O 80 mg, ZnSO 4 .7H 2 O 220 mg, Na 2 MoO 4 210 mg, FeSO 4 .7H 2 O 25 g, EDTA 33.5 g and 1 drop of concentrated H 2 SO 4 per liter.
• Optimized culture medium M4N 10% by volume prepared as described above.
• Optimized culture medium M4N 10% by volume prepared as described above.
• Micro-elements 1 ml/l of the following solution: H 3 BO 3 2.86 g, MnCl 2 .4H 2 O 1.81 g, CuSO 4 .5H 2 O 80 mg, ZnSO 4 .7H 2 O 220 mg, Na 2 MoO 4 210 mg, FeSO 4 .7H 2 O 25 g, EDTA 33.5 g and 1 drop of concentrated H 2 SO 4 per liter.
• Inoculum 10% by volume prepared as described above.
• Culture medium water coming from the industrial water treatment plant, downstream of the secondary treatment, with the composition indicated in Table 1;
• Micro-elements 1 ml/l of the following solution: H 3 BO 3 2.86 g, MnCl 2 .4H 2 O 1.81 g, CuSO 4 .5H 2 O 80 mg, ZnSO 4 .7H 2 O 220 mg, Na 2 MoO 4 210 mg, FeSO 4 .7H 2 O 25 g, EDTA 33.5 g and 1 drop of concentrated H 2 SO 4 per liter.
• Inoculum 10% by volume prepared as described above.
• Culture samples of the three test were collected and subjected to optical density measurements by means of a Varian C 900 spectrophotometer in order to be able to follow the trend of the algal growth.
• the collection strain Tetraselmis su was used.
• the inoculum to be introduced into the culture systems was prepared as follows:
• Vitamins 0.5 ml of the following solution:
• Micro-elements 0.5 ml/l of the following solution:
• Marine salts for seawater (synthetic) 33 g/l;
• Inoculum 10% by volume in the medium F/2 described above.
• Test 2 (Test with Wastewater+Nutrients, Roux 2)
• Inoculum 10% by volume in the medium F/2 described above.
• Inoculum 10% by volume in the medium F/2 described above.
• Culture samples of the three test were collected and subjected to optical density measurements by means of a Varian C 900 spectrophotometer in order to be able to follow the trend of the algal growth.
• the strain has the same proliferation kinetics both in seawater and in the medium consisting of industrial wastewater containing the growth medium F/2. It should be pointed out that, in the case of the medium consisting of wastewater alone (Test 3) the growth kinetics is lower with respect to the other two cases.

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• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Biotechnology (AREA)
• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Organic Chemistry (AREA)
• Genetics & Genomics (AREA)
• Zoology (AREA)
• Wood Science & Technology (AREA)
• Bioinformatics & Cheminformatics (AREA)
• Botany (AREA)
• Microbiology (AREA)
• Medicinal Chemistry (AREA)
• Cell Biology (AREA)
• Virology (AREA)
• Tropical Medicine & Parasitology (AREA)
• Biochemistry (AREA)
• General Engineering & Computer Science (AREA)
• General Health & Medical Sciences (AREA)
• Biomedical Technology (AREA)
• Biodiversity & Conservation Biology (AREA)
• Hydrology & Water Resources (AREA)
• Environmental & Geological Engineering (AREA)
• Water Supply & Treatment (AREA)
• Micro-Organisms Or Cultivation Processes Thereof (AREA)
• Apparatus Associated With Microorganisms And Enzymes (AREA)
• Cultivation Of Seaweed (AREA)
• Treating Waste Gases (AREA)

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Citations (2)

• 2007
  • 2007-06-26 IT IT001278A patent/ITMI20071278A1/it unknown
• 2008
  • 2008-06-17 MX MX2010000246A patent/MX2010000246A/es active IP Right Grant
  • 2008-06-17 US US12/666,650 patent/US7977085B2/en active Active
  • 2008-06-17 AP AP2010005116A patent/AP2010005116A0/en unknown
  • 2008-06-17 BR BRPI0813660 patent/BRPI0813660A2/pt not_active IP Right Cessation
  • 2008-06-17 PT PT2008005206A patent/PT2009000534W/pt unknown
  • 2008-06-17 ES ES201050002A patent/ES2371843B2/es not_active Expired - Fee Related
  • 2008-06-17 WO PCT/EP2008/005206 patent/WO2009000534A1/en not_active Ceased
  • 2008-06-25 AR ARP080102718 patent/AR067153A1/es unknown
• 2009
  • 2009-12-22 TN TNP2009000538A patent/TN2009000538A1/fr unknown
• 2010
  • 2010-01-19 MA MA32527A patent/MA31527B1/fr unknown

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